De Minaur, currently the world number eight, beat Fokina 5-7, 6-1, 7-6(3), with the Aussie saving three championship points in the final set. He was inches away from a loss, but a desperate lob, that clipped the sideline turned the tables for the better and came out victorious.
Williams served nine aces during her return to singles competition after a 16-month-long break due to her long, silent battle with fibroids. A seven-time major champion in women's singles, her last Grand Slam title came at Wimbledon in 2008.
In a span of 40 days, Gauff has won three huge titles and a total of 18 out of her 19 previous matches. She previously won the Washington Open and Cincinnati Open in August.